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package git
import (
"archive/tar"
"fmt"
"io"
"io/fs"
"path"
"sort"
"time"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/object"
)
type GitRepo struct {
r *git.Repository
h plumbing.Hash
}
type TagList []*object.Tag
// infoWrapper wraps the property of a TreeEntry so it can export fs.FileInfo
// to tar WriteHeader
type infoWrapper struct {
name string
size int64
mode fs.FileMode
modTime time.Time
isDir bool
}
func (self TagList) Len() int {
return len(self)
}
func (self TagList) Swap(i, j int) {
self[i], self[j] = self[j], self[i]
}
// sorting tags in reverse chronological order
func (self TagList) Less(i, j int) bool {
return self[i].Tagger.When.After(self[j].Tagger.When)
}
func Open(path string, ref string) (*GitRepo, error) {
var err error
g := GitRepo{}
g.r, err = git.PlainOpen(path)
if err != nil {
return nil, fmt.Errorf("opening %s: %w", path, err)
}
if ref == "" {
head, err := g.r.Head()
if err != nil {
return nil, fmt.Errorf("getting head of %s: %w", path, err)
}
g.h = head.Hash()
} else {
hash, err := g.r.ResolveRevision(plumbing.Revision(ref))
if err != nil {
return nil, fmt.Errorf("resolving rev %s for %s: %w", ref, path, err)
}
g.h = *hash
}
return &g, nil
}
func (g *GitRepo) Commits() ([]*object.Commit, error) {
ci, err := g.r.Log(&git.LogOptions{From: g.h})
if err != nil {
return nil, fmt.Errorf("commits from ref: %w", err)
}
commits := []*object.Commit{}
ci.ForEach(func(c *object.Commit) error {
commits = append(commits, c)
return nil
})
return commits, nil
}
func (g *GitRepo) LastCommit() (*object.Commit, error) {
c, err := g.r.CommitObject(g.h)
if err != nil {
return nil, fmt.Errorf("last commit: %w", err)
}
return c, nil
}
func (g *GitRepo) FileContent(path string) (string, error) {
c, err := g.r.CommitObject(g.h)
if err != nil {
return "", fmt.Errorf("commit object: %w", err)
}
tree, err := c.Tree()
if err != nil {
return "", fmt.Errorf("file tree: %w", err)
}
file, err := tree.File(path)
if err != nil {
return "", err
}
isbin, _ := file.IsBinary()
if !isbin {
return file.Contents()
} else {
return "Not displaying binary file", nil
}
}
func (g *GitRepo) Tags() ([]*object.Tag, error) {
ti, err := g.r.TagObjects()
if err != nil {
return nil, fmt.Errorf("tag objects: %w", err)
}
tags := []*object.Tag{}
_ = ti.ForEach(func(t *object.Tag) error {
for i, existing := range tags {
if existing.Name == t.Name {
if t.Tagger.When.After(existing.Tagger.When) {
tags[i] = t
}
return nil
}
}
tags = append(tags, t)
return nil
})
var tagList TagList
tagList = tags
sort.Sort(tagList)
return tags, nil
}
func (g *GitRepo) Branches() ([]*plumbing.Reference, error) {
bi, err := g.r.Branches()
if err != nil {
return nil, fmt.Errorf("branchs: %w", err)
}
branches := []*plumbing.Reference{}
_ = bi.ForEach(func(ref *plumbing.Reference) error {
branches = append(branches, ref)
return nil
})
return branches, nil
}
func (g *GitRepo) FindMainBranch(branches []string) (string, error) {
for _, b := range branches {
_, err := g.r.ResolveRevision(plumbing.Revision(b))
if err == nil {
return b, nil
}
}
return "", fmt.Errorf("unable to find main branch")
}
// WriteTar writes itself from a tree into a binary tar file format.
// prefix is root folder to be appended.
func (g *GitRepo) WriteTar(w io.Writer, prefix string) error {
tw := tar.NewWriter(w)
defer tw.Close()
c, err := g.r.CommitObject(g.h)
if err != nil {
return fmt.Errorf("commit object: %w", err)
}
tree, err := c.Tree()
if err != nil {
return err
}
walker := object.NewTreeWalker(tree, true, nil)
defer walker.Close()
name, entry, err := walker.Next()
for ; err == nil; name, entry, err = walker.Next() {
info, err := newInfoWrapper(name, prefix, &entry, tree)
if err != nil {
return err
}
header, err := tar.FileInfoHeader(info, "")
if err != nil {
return err
}
err = tw.WriteHeader(header)
if err != nil {
return err
}
if !info.IsDir() {
file, err := tree.File(name)
if err != nil {
return err
}
reader, err := file.Blob.Reader()
if err != nil {
return err
}
_, err = io.Copy(tw, reader)
if err != nil {
reader.Close()
return err
}
reader.Close()
}
}
return nil
}
func newInfoWrapper(
name string,
prefix string,
entry *object.TreeEntry,
tree *object.Tree,
) (*infoWrapper, error) {
var (
size int64
mode fs.FileMode
isDir bool
)
if entry.Mode.IsFile() {
file, err := tree.TreeEntryFile(entry)
if err != nil {
return nil, err
}
mode = fs.FileMode(file.Mode)
size, err = tree.Size(name)
if err != nil {
return nil, err
}
} else {
isDir = true
mode = fs.ModeDir | fs.ModePerm
}
fullname := path.Join(prefix, name)
return &infoWrapper{
name: fullname,
size: size,
mode: mode,
modTime: time.Unix(0, 0),
isDir: isDir,
}, nil
}
func (i *infoWrapper) Name() string {
return i.name
}
func (i *infoWrapper) Size() int64 {
return i.size
}
func (i *infoWrapper) Mode() fs.FileMode {
return i.mode
}
func (i *infoWrapper) ModTime() time.Time {
return i.modTime
}
func (i *infoWrapper) IsDir() bool {
return i.isDir
}
func (i *infoWrapper) Sys() any {
return nil
}
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